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konfidensintervall



.18.1.a.18.2.a.18.2.c
Konfidens9595,009990
Z, z-verdi1,961,962,5751,645
n, utvalg100300,00300700
S, std, spredning7,52,0025
u, snitt x220,200,2-100,2
E, feilmargin =Z*(S/ROT(n)) =B3*(B5/ROT(B4))1,470,230,2970,31
Minst =u-E =B6-B720,53-0,03-0,097-100,51
Max =u+E =B6+B723,470,430,497-99,89
Konfidensintervallengde=2E2,940,450,590,62

Finne nødvendig utvalg for å få intervallengde 1:

  • lengde=2*z*(s/rot(n))
    • 1=2*1,96*(4/rot(n))
      • 1*rot(n)=2*1,96*4
      • rot(n)=2*1,96*4
      • rot(n)=15,68
      • rot(n)^2=15,68^2
      • n=245,86
      • =vi må ha utvalg på minst 246

.18.3
Konfidensnivå95
Z, z-verdi1,96
u, snitt x4
Konfidensintervallengde1,00
S, std, spredning4
E, feilmargin =(Z*(S/ROT(n)))=(1,96*(4/rot(n))) (=B16/2)0,5
.1=2*(1,96*(4/rot(n))) (=B16*2*B14)3,92
.1*rot(n) =(2*Z)*S =(2*1,96)*4 =3,92*4 (=B20*4)15,68.((Knfdslngd*2*Z)*S)^2
n, utvalg= rot(n)^2 =15,68^2 (=B21^2)245,9.((B16*2*B14)*B17)^2

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